Artificial tooth



4 G.'G.DURR. ARTIFICIAL TOOTH. 2 v I I Patented Aug. 29,1893.

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UNITED STATES PATENT OFFICE.

CHARLES C. DURR, OF PLYMOUTH, INDIANA.

ARTIFICIAL TOOTH.

SPECIFICATION forming part of Letters Patent No. 504,126, dated August29,1893.

Application filed April 18, 1893- Serial No. 470,847. (No model.)

To aZZ whom it may concern: I

Be it known that I, CHARLES C. DURR, a

- citizen of the United States, residing at Plymouth, in the county ofMarshall and State of Indiana, have invented certain new and usefulImprovements in Artificial Teeth; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the annexed drawings, making a part of this specification,and to the letters of reference marked thereon.

The present invention has for its object to provide means for attachingartificial crowns to the roots of natural teeth whereby a firm and rigidconnection is made that will successfully resist the force of thepressure put upon the crown while masticating, which object I attain bythe means substantially as shown in the drawings and hereinafterdescribed and claimed.

Figure 1 of the drawings represents a perspective view of the root of anatural tooth and the tube or band employed in forming a connectionbetween the root and the crown; Fig. 2 a side elevation of the rootshowing the tube or band in position over the same and in section whenan impression of the face of the root is to be taken by means of wax orother like material; Fig. 3 a sectional elevation of the tube or bandwhen removed, showing the wax impression and the mold obtainedtherefrom; Fig. 4 a detail View in perspective of the tube or bandshowing it slit to form claws; Fig. 5 a similar view showing the clawsbent in shape to receive the material which is to form the artificialcrown; Fig. 6 a sectional view showing the tube or band and the crownconnected together. Fig. 7 represents a perspective view showing thecomplete crown connected to the root of the natural tooth.

In the accompanying drawingsA represents the root of a natural tooth andB the metal band or tube of the required size and thickness to fitaccurately to the prepared root.

In carrying out my invention, the tube or band when made to nicely fitthe root is placed thereon and filled with wax or some other impressionmaterial which is pressed well up or against the face of the root so asto properly take a clean impression thereof, asshown in After the castfrom the impression has thus been made the wax or other impressionmaterial is removed from inside the tube or band I and the sides thereofslit as shown in Fig. 4 so as to provide claws c entirely around thecircumference of the tube or band. The claws are then bent over by anysuitable means as shown in Fig. 5, the cast of the face of the root asindicated at b forming a guide for the depth of crown as well as for thecrown itself. These claws are so arranged, twisted and shaped, as toprovide the greatest possible surface for attachment to the porcelain orother material used in making the crown which is shown at 0, Figs. 6 and7, the claws extending well up into the crown to make it rigid andstrong.

Before applying the material which is to form the crown,the tube or bandis filled with tissue paper to prevent the material from running insidethe tube or band, the cast of the face of the root being first removed.After the crown is thus completed with its tube or band, it is connectedto the root of the natural tooth by suitable cement, the tube or bandwithits claws being adapted to all class of crown work and providing avery strong and durable means of forming a connection between the rootofthe natural tooth and the artificial crown.

Filling the tube with plaster of paris or other suitable material tosecure a model of the face of the root provides a very simple means ofobtaining a guide to turn or bend the claws and also as a guide to thedepth of the crown. 7

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is-

1. The method substantially herein described of connecting artificialcrowns to the roots of natural teeth, consisting in first forming a tubeor band to fit the root, placing the same over the root and taking animpression of the face thereof by placing in the tube or band a suitableimpression material, remov ing the tube or band and taking a mold fromIn testimony that I claim the above I have the impression to serve as aguide, slitting and hereunto subscribed my name in the presence 10bending the tube or band and forming the of two Witnesses. crown thereonas set forth.

5 2. A tube or band slitted as shown to form CHARLES DURR' inwardlyextending claws for connecting Witnesses: thereto an artificial crown,substantially as H. A. LOGAN, and for the purpose set forth. CHAS. P.DRUMMOND.

